You can bolt in any front seats. I've heard even 08-10 will work with the 00-07's. The 05+'s have a different design (stiching) and a little more bolster and some of them are heated... So look for a totaled 05-07 and get heated seats out of the deal. The local pick a part here only charges $12.95 with a $1 dollar core charge. I keep waiting to find a set of heated ones I like.
Current: 2013 Focus ST II.
Past: 06 Explorer
Past: 03 Focus ZX3 Modded: Rims, SVT Bolt-Ons, Tons of audio stuff with Kenwood Headunit, MB Quart Components, and Subthump Stealth Hatch Enclosure and Amp Rack Loaded with Kicker Goodies!